scholarly journals A strong steric hindrance effect on ground state, excited state, and charge separated state properties of a CuI-diimine complex captured by X-ray transient absorption spectroscopy

2014 ◽  
Vol 43 (47) ◽  
pp. 17615-17623 ◽  
Author(s):  
J. Huang ◽  
M. W. Mara ◽  
A. B. Stickrath ◽  
O. Kokhan ◽  
M. R. Harpham ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Steady State ◽  
Absorption Spectroscopy ◽  
Steric Hindrance ◽  
Ground State ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Interfacial Electron Transfer ◽  
X Ray

Steady-state and transient structures of a copper diimine dye sensitizer on TiO2 nanoparticles undergoing photoinduced interfacial electron transfer are determined.

Triplet Excited State Distortions in a Pyrazolate Bridged Platinum Dimer Measured by X-ray Transient Absorption Spectroscopy

2010 ◽  
Vol 114 (48) ◽  
pp. 12780-12787 ◽  
Author(s):  
Jenny V. Lockard ◽  
Aaron A. Rachford ◽  
Grigory Smolentsev ◽  
Andrew B. Stickrath ◽  
Xianghuai Wang ◽  
...  
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Triplet Excited State ◽  
X Ray

Excited-state molecular structures captured by X-ray transient absorption spectroscopy: a decade and beyond

2010 ◽  
Vol 66 (2) ◽  
pp. 240-251 ◽  
Author(s):  
Lin X. Chen ◽  
Xiaoyi Zhang ◽  
Jenny V. Lockard ◽  
Andrew B. Stickrath ◽  
Klaus Attenkofer ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Metal Complexes ◽  
Absorption Spectroscopy ◽  
Chemical Reaction ◽  
Transient Absorption ◽  
Molecular Structures ◽  
Transient Absorption Spectroscopy ◽  
Reaction Pathways ◽  
X Ray

Transient molecular structures along chemical reaction pathways are important for predicting molecular reactivity, understanding reaction mechanisms, as well as controlling reaction pathways. During the past decade, X-ray transient absorption spectroscopy (XTA, or LITR-XAS, laser-initiated X-ray absorption spectroscopy), analogous to the commonly used optical transient absorption spectroscopy, has been developed. XTA uses a laser pulse to trigger a fundamental chemical process, and an X-ray pulse(s) to probe transient structures as a function of the time delay between the pump and probe pulses. Using X-ray pulses with high photon flux from synchrotron sources, transient electronic and molecular structures of metal complexes have been studied in disordered media from homogeneous solutions to heterogeneous solution–solid interfaces. Several examples from the studies at the Advanced Photon Source in Argonne National Laboratory are summarized, including excited-state metalloporphyrins, metal-to-ligand charge transfer (MLCT) states of transition metal complexes, and charge transfer states of metal complexes at the interface with semiconductor nanoparticles. Recent developments of the method are briefly described followed by a future prospective of XTA. It is envisioned that concurrent developments in X-ray free-electron lasers and synchrotron X-ray facilities as well as other table-top laser-driven femtosecond X-ray sources will make many breakthroughs and realise dreams of visualizing molecular movies and snapshots, which ultimately enable chemical reaction pathways to be controlled.

Ultrafast excited state relaxation dynamics in a heteroleptic Ir(iii) complex, fac-Ir(ppy)2(ppz), revealed by femtosecond X-ray transient absorption spectroscopy

2021 ◽  
Author(s):  
Jungkweon Choi ◽  
Mina Ahn ◽  
Jae Hyuk Lee ◽  
Doo-Sik Ahn ◽  
Hosung Ki ◽  
...  
Keyword(s):  
Excited State ◽  
Time Constant ◽  
Absorption Spectroscopy ◽  
Internal Conversion ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Relaxation Dynamics ◽  
X Ray ◽  
Forbidden Transition ◽  
Calculation Results

The experimental and calculation results demonstrate that the 3MLppzCT state generated by the spin-forbidden transition rapidly relaxes to 3MLppyCT through internal conversion process with a time constant of ∼450 fs.

Structure and excited-state dynamics of dimeric copper(i) photosensitizers investigated by time-resolved X-ray and optical transient absorption spectroscopy

2021 ◽  
Vol 23 (5) ◽  
pp. 3656-3667
Author(s):  
Lucía Velasco ◽  
Leonel Llanos ◽  
Pedro Levín ◽  
Andrés Vega ◽  
Jin Yu ◽  
...  
Keyword(s):  
Excited State ◽  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Optical Absorption Spectroscopy ◽  
Time Resolved ◽  
X Ray ◽  
Solvent Type ◽  
Optical Transient

Three homoleptic Cu(i) dimeric photosensitizers are studied through ultrafast X-ray and optical absorption spectroscopy. The complexes show distinct excited state lifetimes, due to the solvent type and spacers' flexibilities between the Cu centres.

Highly Accurate Excited-State Structure of [Os(bpy)2dcbpy]2+ Determined by X-ray Transient Absorption Spectroscopy

2014 ◽  
Vol 136 (24) ◽  
pp. 8804-8809 ◽  
Author(s):  
Xiaoyi Zhang ◽  
Sophie E. Canton ◽  
Grigory Smolentsev ◽  
Carl-Johan Wallentin ◽  
Yizhu Liu ◽  
...  
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
State Structure ◽  
X Ray

scholarly journals Excited state electron and energy relays in supramolecular dinuclear complexes revealed by ultrafast optical and X-ray transient absorption spectroscopy

2018 ◽  
Vol 9 (4) ◽  
pp. 860-875 ◽  
Author(s):  
Dugan Hayes ◽  
Lars Kohler ◽  
Ryan G. Hadt ◽  
Xiaoyi Zhang ◽  
Cunming Liu ◽  
...  
Keyword(s):  
Excited State ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Dinuclear Complexes ◽  
X Ray ◽  
Ultrafast Optical ◽  
State Electron ◽  
Charge Hopping

Complementary ultrafast techniques provide clear observation of charge hopping between metals in dinuclear complexes.

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